package com.liuyfly.leetcode.study;

import com.liuyfly.leetcode.util.LeetcodeUtil;

/**
 * @author liuyangfang at 2022-09-27 20:40
 */
public class ReverseString {
    /**
     * 编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。
     * <p>
     * 不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。
     * </p>
     * 
     * <pre>
    示例 1：
    输入：s = ["h","e","l","l","o"]
    输出：["o","l","l","e","h"]
     * </pre>
     * 
     * <pre>
    示例 2：
    输入：s = ["H","a","n","n","a","h"]
    输出：["h","a","n","n","a","H"]
     * </pre>
     * 
     * 链接：https://leetcode.cn/leetbook/read/array-and-string/cacxi/
     */
    public static void reverseString(char[] s) {
        if (s.length == 0 || s.length == 1) {
            return;
        }
        int middle = s.length >> 1;
        for (int i = 0; i < middle; i++) {
            char temp = s[i];
            s[i] = s[s.length - i - 1];
            s[s.length - i - 1] = temp;
        }
    }

    public static void main(String[] args) {
        char[] s = "hello".toCharArray();
        LeetcodeUtil.printArray(s);
        reverseString(s);
        LeetcodeUtil.printArray(s);
    }
}
